Laminated core



Aug. 26, 1969 v. R. SCARDINA ETAL 3,463,955

LAMINATED CORE Filed Nov. 14, 1966 United States Patent 3,463,955 LAMINATED CORE Virgil R. Scardiua, Milford, and Paul D. Wagrer, Cm-

cinnati, Ohio, and Raymond L. Brezic, Garland, Tex.,

assignors to Allis-Chalmers Manufacturing Company,

Milwaukee, Wis.

Filed Nov. 14, 1966, Ser. No. 594,116 Int. Cl. H02k 1/06 US. Cl. 310-217 5 Claims ABSTRACT OF THE DISCLOSURE A laminated core for an electrical machine having a plurality of laminations each disposed in a plane parallel to the axis of the machine. End heads are provided at each end of the laminations to hold the assembly together. At least one of the end heads is provided with holding means which mate with complementary holding means on the end edge of each lamination to thereby hold the laminations in the axially stacked position during assembly of the core.

A number of electrical machines require a core having laminations disposed radially about an axis and in a plane extending parallel to the axis. The laminations are in effect placed on end about the axis. It is quite difficult to contain these laminations in this on-end position while the core is being assembled. Special stacking fixtures are required to orient the laminations properly and to hold them during assembly of the core. After all of the laminations are positioned in the stacking fixture, accurately machined end rings are positioned about the ends of the laminations to hold them in place. In the event the core is designed for rotation, balancing rings are also applied to the ends of the core.

It is the general object of this invention to provide a single component (hereinafter referred to as an end head) which combines the function of the stacking fixtures necessary to orient the laminations and the end rings necessary to retain the laminations.

A more specific object is to provide an end head capable of performing the above described functions which is made by a simple series of stamping and forming operations suitable for quantity production.

A further object of the subject invention is to provide an end head of the hereinbefore described type with additional means for grouping the laminations.

An additional object of the subject invention is to provide an end head of the hereinbefore described type with integral fan blades thereon.

Still a further object of the subject invention is to provide an end head of the hereinbefore described type with additional balancing means.

These and other objects of the present invention will be more fully understood as the following description is read in light of the attached drawing wherein:

FIG. 1 is a plan view of an end head constructed in accordance with the invention;

FIG. 2 is an elevated view partially in section showing a core constructed in accordance with the invention; and

FIG. 3 is a partial cross sectional view taken along the line IIIIII in FIG. 1.

'Referring to the application drawings, a typical form of end head generally designated '6 includes an annular raised portion 7. This raised portion 7 conforms in width to the length of a recess 8 provided in the ends of laminations 9. The recess in the laminations is such that it can be forced onto the raised portion 7 to thereby hold the lamination in an axial plane about the axis of the end head.

3,463,955 Patented Aug. 26, 1969 ice It it is desired to group laminations, tabs 11 may be formed about the periphery of the end heads. These tabs are then bent at with the plane of the end head to separate the groups of laminations.

Furthermore, a plurality of circumferentially spaced indented tabs 12 may be provided if the core will be utilized as a rotating assembly. The indented tabs may be used for balancing weights where necessary.

Furthermore, a plurality of circumferentially spaced bent vanes 13 may also be provided for a rotating assembly. These vanes will act as fan blades to provide cooling for the assembly. Additionally, a plurality of circumferentially spaced through holes 14 are provided in each end head. These through holes receive connecting means which may be in the form of a rod 1'6 and spring type retaining clip 17 or any other generally known type of elongated fastening means.

From the above description it can be seen that a very inexpensive and efficient manner of assembling axially disposed laminations is herein provided. Due to the mating shape of the end head and the end recess in the laminations, each lamination may be forced onto an end head and will remain in position without any additional holding means or fixture. After all of the laminations have been positioned, the other end head is placed on the opposite end of the laminations. Through bolts or connecting means are then passed through the holes in each end head and clamp the end heads to opposite ends of the laminations. The resulting assembly is sufliciently rigid for subsequent rotation of the core. The use of these end heads in the manner described eleminates the need for separate stacking fixtures, machined end rings, balancing rings and considerably reduces the time required for manufacturing the lamination stack illustrated. The end heads retain the laminations in the desired position with sufficient mechanical integrity to prevent any movement of the laminations during assembly, subsequent handling or operating conditions.

From the above description, it can be seen that a relatively inexpensive stamping and forming operation can be utilized in manufacturing these end heads. Furthermore, the end heads are quite versatile in that they are used both as an assembly fixture as well as the final end ring for the assembled core.

Although only one embodiment of the invention has been herein shown and described, other embodiments will be obvious to those skilled in the art after reading this description and it is intended that all such embodiments as come within a reasonable interpretation of the appended claims be covered.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A cylindrical laminated core for a machine having an axis comprising: a pair of axially spaced end heads disposed substantially normal to said machine axis; a plurality of laminations each disposed in a plane parallel to said machine axis and positioned between said end heads; first holding means on one of said end heads; second holding means on one end of each of said laminations to hold same in said axially parallel plane when said laminations are placed in engagement with said first holding means during assembly of the core; and means engaging both of said end heads to hold same into firm engagement with opposite ends of said laminations.

2. The laminated core set forth in claim 1 wherein said end heads are stampings and one of said holding means is an annular raised portion formed on the face of said end head and said other holding means is a recess formed in the endof said laminations.

3. The laminated core set forth in claim 2 and further comprising a plurality of circumferentially spaced tabs formed on said end heads and extending between groups of said laminations.

4. The laminated core set forth in claim 2 and further comprising a plurality of indented tabs formed in said end head and susceptible of being bent outward to provide a 5 mounting for balancing Weights.

5. The laminated core set forth in claim 2 and further comprising a plurality of indented vanes formed in said end head and susceptible of being bent outward to form fan blades.

4 7 References Cited UNITED STATES PATENTS 532,795 1/1895 Lemp 310-217 1,677,762 7/ 1927 Gil'burg 310217 X 3,145,313 8/1964 Tupper 310-259 MILTON O. HIRSHFIEL-D, Primary Examiner.

=R. SKUDY, Assistant Examiner. 

